Valve.



UnTTnn @Tatras PaTnNT @Trient SYLVESTER VILSON, OE CLOQUET, MINNESOTA.

VALVE.

SPECIFCATION forming part of Letters Patent No. 696,615, dated April 1 ,1902.

Serial No. 61,283. (No model.)

T0 all whom t may concern:

Be it known that I, SYLVESTER WILSON, a citizen of the United States, residing at and Whose post-office address is Cloquet, in the county of Carlton and State of Minnesota, have invented new and useful Improvements in Valves, of which the following is a speciiication.

This invention relates to safety-valves for sawmill-carriages; and the principal object of the invention is to provide a valve of such construction as to render the valve automatic for the purpose of instantly shutting off the supply of steam in case breakage occurs in the valve-operating connections, the valve being constructed and arranged to close b y gravity.

Sawmill-carriages are usually dri ven by the piston-rod of a steam-cylinder, and as there are oftentimes several men working on the carriage, which travels very rapidly, should the valve connections break or get out of order the sawmill-carriage is liable to run away, with the result that the men employed on the carriage are often seriously injured.

It is therefore the object of this invention to provide a valve which will close automatically and stop the carriage in case the valve connections break or get out ot' order.

With the above object in view the invention consists in the novel construction, combination, and arrangement hereinafter fully described, illustrated, and claimed.

The accompanying drawing represents a diagrammatical elevation of the steam-cylinder of a sawmill-carriage and the improved valve mechanism applied thereto.

Referring to the drawing, 1 designates the steam-cylinder7 in which is arranged a reciprocating piston mounted upon the piston-rod 2, passing through a suitable stuffing-box 3, and adapted to connect with the sawmill-carriage for reciprocating the latter.

The steam-supply pipe (represented at et) is connected at its opposite ends to twin valvecasings 5, which in turn are placed in communication with the opposite ends of the steam-cylinder 1 by means of the terminal conduits 6. Each valve-casing comprises an induction-port 7, with which the steam-supply pipe 4 communicates, and an eductionport 8, with which one of the terminal conduits 6 communicates. Each valve-casing also comprises a valve-chamber 9, which extends vertically and in which is arranged a reciprocatory valve 10, provided with a pair of terminal heads 11 and 12, adapted to alternately open and close the induction and eduction ports, as well as the exhaust-port 13, which is in communication with the exhaustpipe 14. Each valve is further provided with a valve-stem la, passing through a stuffingbox 15 in the bottom of the valve-casing. One of the stems laa is pivotally connected to the middle arm 16 of a T-lever 17, to another arm of which is attached the valve-operating connection 18. The remaining arm of the T- lever has attached thereto a connecting-rod 19, which at its opposite end connects with an elbow-lever 20, associated pivotally with the lower extremity of the other valve-stem laf. By means of the construct-ion just described the valves are simultaneously reciprocated in opposite directions for alternately supplying steam to the opposite ends of the cylinder 1 and exhausting the steam therefrom.

It will be seen from the foregoing description that hy reason of the fact that the valves are arranged to reciprocate in vertical paths should the connecting-rod 19 or the operating-levers or-their pivots become broken or disarranged the valves, which are of considerable weight,will gravitate to the bottoms of the valve-chambers, with the result that the supply of steam to the cylinder will be instantly cut o ff and the movement of the sawmill-carriage checked., The sawmill-carriage is thus prevented from running away and injuring the workmen thereon.

Having' thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination with the steam-cylinder of a sawmill-carriage; of twin valves comprising valve-casings respectively in communication with the opposite ends of the cylinder and each having an exhaust, a steamsupply pipe leading to both valve-casings, vertically-movable valves adapted to alternately open and close the steam ports and exhausts, and reversely-disposed elbow-lc- IOO In testimony whereof I ax my signature Vers coupled togetherand connected with said in presence of lnwo wlt'nesses.

valves to simultaneously admit steam to one end of the cylinder and exhaust from the opposite end, both valves being adapted to au- SYLVESTER WILSON 5 tomatioally and simultaneousely shut oft' lche I Witnesses:

CHAS. B. WATKINS, W. I-I. WILSON.

supply of steam t0 lche cylinder in ease of breakage of the Valve-0perating connections. 

